Code demo

Basic code (no language)

# cQASM, selected "No Language" because cQASM can't be selected
version 1.0
qubits 2

# Initialize qubits in |+> and |-> state
.initialize
prep_z q[0:1]
X q[1]
{H q[0]|H q[1]}

JavaScript

// [!code highlight:3]
function setUserName() {
  const myName = prompt("Please enter your name.");
  if (!myName) {
    setUserName();
  } else {
    localStorage.setItem("name", myName);
    myHeading.textContent = `Mozilla is cool, ${myName}`;
  }
}

HTML with selected lines

<ol>
  <li>Selected</li> // [!code highlight]
  <li>Not selected</li>
  <li>Selected</li> <!-- [!code highlight] -->
  <li>Selected</li>
  <li>Not selected</li>
  <li>Selected</li>
  <li>Not selected</li>
  <li>Not selected</li>
</ol>